[TriLUG] at&t fiber

Wed Sep 6 12:43:07 EDT 2017

Very good information and details!

In my case, the ONT is on the inside of my house.  They ran shielded fiber connection to a junction box next to my house power connection - just to provide a ground connection for the wire from the curb.  The junction box is simply a fiber coupler that connects the fiber to the ONT inside the house.

As for the passthrough mode; yeah, I had to deal with that.  Initially, I could not get any IPSec traffic established to other IPSec devices outside the house, but OpenVPN connections worked just fine.  It seems AT&T recently made a change as I can now connect multiple IPSec and OpenVPN connections with other nodes outside the house.

-Ron

On Sep 6, 2017, at 12:34 PM, Wes Garrison <wes at xitechusa.com> wrote:

They install an "ONT" (Optical Network Terminal) on the outside of the house that hands it off to a CAT 5e Ethernet straight to your "modem".

Unfortunately the NVG599 router AT&T provides does not support true passthrough, only a sort of hybrid DMZ mode, so using your own router behind it is not as seamless as it could be.
(google for NVG599 passthrough and you'll see what I mean; I think we've discussed that on this list before)

It authenticates with 802.1x so you really can't replace it, even though it's standard Ethernet.  Yay for taking standards and making them not standard!

AT&T and Google both use PON technology <https://en.wikipedia.org/wiki/Passive_optical_network> to do this, which means they literally split the fiber.

The downstream bandwidth uses WDM (Wave Division Multiplexing), so everyone get's their own wavelength and essentially gets full "switched" bandwidth back to the OLT (Optical Light Terminal), where it splits.

AT&T uses TDM (Time Division Multiplexing) for the upstream bandwidth, though, so you're sharing upstream with everyone on your split; usually about 32 houses, I think.  PONs can be split up to 128 ways, but I think AT&T only goes up to 32 ways - maybe 16, I can't recall properly.

Google uses WDM for upstream too, so you effectively get all of your bandwidth in both directions.

I'm not sure Google Fiber actually exists, though.

-Wes

_________________________________
Wesley S. Garrison
Network Engineer
Xitech Communications, Inc.
phone:  (919) 260-0803
fax:       (919) 932-5051
__________________________________
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On Wed, Sep 6, 2017 at 12:18 PM, karl flores via TriLUG <trilug at trilug.org <mailto:trilug at trilug.org>> wrote:
Q. Did you/they have to rewire house to get fiber to your devices?

On Wed, Sep 6, 2017 at 12:06 PM, Ron Kelley via TriLUG <trilug at trilug.org <mailto:trilug at trilug.org>>
wrote:

> Have AT&T fiber for about 1yr now (in Apex) - full GigE connection ($75/mo
> I think)
>
> Just ran Speed test again.  Still getting 720Mbps download and 915Mbps
> upload.  Really like the service.
>
>
> -Ron
>
>
>
>
> On Sep 6, 2017, at 11:50 AM, Hilmar Lapp via TriLUG <trilug at trilug.org <mailto:trilug at trilug.org>>
> wrote:
>
> I may have missed earlier reports about the experience from folks who
> adopted AT&T Fiber. They’ve laid the fiber in our neighborhood a year ago
> and of course now they aggressively try to sell it to everyone.
>
> I can’t say their pricing is aggressive – we’re not cable TV customers so
> their bundles including TV don’t appeal to us, and internet-only is about
> the same as with TWC/Spectrum 300Mbps – but they claim that their bandwidth
> is way more consistent high at >300 Mbps than TWC/Spectrum cable. Even if
> that were to be true right now, it seems like that could well be explained
> by the network not being as crowded yet as far from everyone has signed on
> yet.
>
> Any experience of folks out there with AT&T Fiber? If bandwidth was indeed
> great and highly consistent at first, did it stay that way or deteriorated
> as more people in the neighborhood signed on?
>
>  -hilmar
> --
> Hilmar Lapp -:- lappland.io <http://lappland.io/>
>
>
>
> --
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